Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1029/2008WR007695
Title (Primary) Streamflow prediction in ungauged catchments using copula-based dissimilarity measures
Author Samaniego, L. ORCID logo ; Bárdossy, A.; Kumar, R. ORCID logo
Source Titel Water Resources Research
Year 2010
Department CHS
Volume 46
Page From W02506
Language englisch
Abstract There are many procedures in the available literature to perform prediction in ungauged basins. Commonly the Euclidean metric is used as a proxy of the hydrologic dissimilarity. Here we propose a procedure to ¯nd a metric based on dissimilarity measures that are estimated from pairwise empirical copula densities of runo®. A metric is then de¯ned in an transformed space of basin descriptors, whose parametrization is obtained with a variance reducing technique. A hydrologic model was run in an ungauged basin with sets of global parameters obtained from the k-nearest neighboring donor basins using various metrics to take into account the uncertainty of its parametrization. Hydrologic model parameters were regionalized with a multiscale parameter regionalization technique whose transfer-function parameters were found via calibration. The stream°ow in an ungauged basin was found as an ensemble stream°ow prediction to account for the uncertainties of the transfer function parameters as well as those to de¯ne the metric. This technique was applied in 38 German basins ranging in size from from 70 to 4000 km2. For each basin a number of catchment descriptors and several climatic indices were quanti¯ed, e.g. mean slope, aspect, shape factor, mean elevation, mean monthly temperature in January, among others. Daily stream°ow time series correspond to the period from 1961 to 2000. Simulated daily discharge were validated with a Jackknife crossvalidation technique. Nash-Sutcli®e e±ciencies obtained in this way ranged between 0.76 to 0.86. These results suggested that the proposed technique would produce reasonable results in ungauged basins.
Persistent UFZ Identifier
Samaniego, L., Bárdossy, A., Kumar, R. (2010):
Streamflow prediction in ungauged catchments using copula-based dissimilarity measures
Water Resour. Res. 46 , W02506 10.1029/2008WR007695